Does anyone know if there is a way to add a blind spot monitoring system to my 2011 dodge Charger R/T either as an individual set up or as part of accessory package ?

 

It's for sure an option on the 2012's. You'll need to see if the wiring is there at the plug inside the door panel. If the harness is there for it, you may be able to turn it on with AlfaOBD. 2011 was kind of an odd year as the first year of that generation and no SRT that year; some options weren't available until a year later.